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An improved block-oriented simulation methodology of vehicle air conditioning systems has been developed, based on dynamic and thermodynamic formulations of automotive components. The method applied considers any system as dynamic and the steady-state as a particular condition reached during transient states. Therefore it is necessary for every component of the system to define the dynamic laws, the dynamic constants and to impose the initial conditions. A few examples of modeled components are described in order to show the consistency of the thermodynamic differential approach and input/output relations between subsystems. An alternative approach of experimental look-up tables with respect to the thermodynamic differential method has also been applied, whenever it was convenient in terms of calculation improvements.